Error trying to write data using GCDAsyncSocket on iOS 5.1

Question

I'm trying to use GCDAsyncSocket in my iOS app. I've been following all the step provided in the CocoaAsyncSocket's wiki. Here is what I'm doing:

 GCDAsyncSocket socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

    NSError *err = nil;
    if (![socket connectToHost:@"192.168.0.129" onPort:2811 error:&err]) // Asynchronous!
    {
        // If there was an error, it's likely something like "already connected" or "no delegate set"
        NSLog(@"I goofed: %@", err);
    }

    uint8_t buffer[2] = "1\n";

    NSData *data = [NSData dataWithBytes: &buffer length: sizeof(buffer)];
    [socket writeData:data withTimeout:10 tag:1];

I already included too frameworks dependences: Security & CFNetwork, and included in my class the respective delegate. Do I need any other configuration to use it?

When I run this example I get this error:

[NSMallocBlock bytes]: unrecognized selector sent to instance 0x6b7abe0 'NSInvalidArgumentException', reason: '-[NSMallocBlock bytes]: unrecognized selector sent to instance 0x6b7abe0'

And it occurs on this line of GCDAsyncSocket.m

const uint8_t *buffer = (const uint8_t *)[currentWrite->buffer bytes] + currentWrite->bytesDone;

Answer 1

try use this to convert your data, from string to data

    +(NSData *) DataToHex: (NSString *) string
{
    string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];
    int stringLength = string.length;
    NSMutableData *hexStringArray = [[NSMutableData alloc] init];
    [hexStringArray setLength:0];
    unsigned char whole_byte;

    char byte_chars[3] = {'\0','\0','\0'};
    int i;
    for (i=0; i < stringLength/2; i++) 
    {
        byte_chars[0] = [string characterAtIndex:i*2];
        byte_chars[1] = [string characterAtIndex:i*2+1];
        whole_byte = strtol(byte_chars, NULL, 16);
        [hexStringArray appendBytes:&whole_byte length:1]; 
    }                                                                       //this is auto way

    return hexStringArray;
}